Winter Pool Ice-Expansion Compensator & Main-Drain Air-Lock Pressure Sizer

Deterministic Ice phase-change 9.05% volumetric strain relief + hydrostatic U-tube air-lock equilibrium P_air = rho * g * H_water engine (.pdf, .json, .svg) built for AstralPool, Hayward, Pentair, Gizzmo — zero-upload ephemeral Wasm RAM execution.

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